Look Unto the Rock

The central theme of Isaiah 51 is God's comfort. It comes with a promise: "For the Lord shall comfort Zion" (V3). Typically, Zion is God's elect, the church. The effectual of grace is plain: referring to Abraham, a type of God's elect: "I called him alone". The call says, "Look unto the Rock", who is Christ (1 Corinthians 10:4). The doctrine is plain: "follow after righteousness", which Christ established.